1. Write a 0 to select the solar power charging configuration.
5.7 Connecting the Communication Pins
The base board communications connections to the DXM100-B1 Wireless Controller are RS-485 (primary), RS-485
(secondary) or RS-232. The base board communications connections to the DXM100-B2 Wireless Controller are RS-485
(primary) and RS-485 (secondary).
RS-485
. The primary RS-485 bus is a common bus shared with the ISM radio board (Modbus Slave ID 1) or optional cellular
board. The DXM100/1000-Bx Wireless Controller is defined as the Modbus Master on this bus. Other internal Modbus slaves
include the local processor registers (Modbus Slave ID 199), the base I/O controller (Modbus Slave ID 200), and the display
board (Modbus Slave ID 201). When assigning Modbus Slave IDs to externally connected devices, only use IDs 2 through
198.
RS-232
. The RS-232 bus is not currently defined for the DXM100-B1 models. There is no RS-232 for the DXM100-B2
models.
Pin
Parameter
Description
Pin 6
Primary RS-485 –
Running Modbus protocol at 19.2k baud, use this bus to connect to other Modbus Slave devices.
The DXM100/1000-Bx Wireless Controller is a Modbus Master device on this RS-485 port.
Pin 7
Primary RS-485 +
Pin 9
RS-232 Tx
Serial RS-232 connection. This bus must use a ground connection between devices to operate
correctly. (DXM100-B1 models only; not available on the DXM100-B2 models)
Pin 10
RS-232 Rx
Pin 13
Secondary RS-485 –
The DXM100/1000-Bx Wireless Controller is a Modbus slave on this bus (see
Pin 14
Secondary RS-485 +
Pin 15
CANL –
DXM100-B1 models only. Not available on the DXM100-B2 models.
Pin 16
CANH +
5.8 Modbus RTU Master and Slave Ports
The DXM can be a Modbus RTU master device to other slave devices and can be a Modbus slave device to another Modbus
RTU master. The DXM uses the primary RS-485 port (M+/M-) as a Modbus RTU master to control external slave devices. All
wired devices connected to the master RS-485 port must be slave devices.
•
As a Modbus RTU master device, the DXM controls external slaves connected to the primary RS-485 port, the local
ISM radio, local I/O base board, and the local display board.
•
As a Modbus RTU slave device, the DXM local registers can be read from or written to by another Modbus RTU
master device.
The secondary port (S+/S-) is the Modbus RTU slave connection. The secondary (slave) Modbus RS-485 port (S+/S-) is
controlled by another Modbus master device, not the DXM. The slave port is used by an external Modbus master device that
will access the DXM as a Modbus slave device.
Use the configuration software to define operational settings for both the Modbus RTU master port and the Modbus RTU
slave port.
Use the DXM's LCD menu to set the Modbus Slave ID for the secondary RS-485 port.
Sure Cross
®
DXM100-Bx and DXM1000-Bx Wireless Controllers
28
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